glenda.party
term% ls -F
term% pwd 
$home/manuals/unix_v8/3/erf
term% cat index.txt 
ERF(3M)                                                                ERF(3M)

delim $$

NAME
       erf, erfc - error function

SYNOPSIS
       #include <math.h>

       double erf(x)
       double x;

       double erfc(x)
       double x;

DESCRIPTION
       These  functions calculate the error function erf(x) and the complemen‐
       tary error function erfc(x) = 1 - erf(x).  The error criterion for both
       erf and erfc is relative.

DIAGNOSTICS
       There are no error returns.

                                                                       ERF(3M)